hacking: remove unused variable author_tag_re
hacking: remove unused variable author_tag_re

Commit 571893ab42ee45bc48422b0ddf099612fd99c439 removed the hacking
check rule, but forgot variable author_tag_re. Let's remove it.

Change-Id: I39022ac8d3dbfcc0e947f782749325434e6769fd

cloudbase/nova,Stavitsky/nova,scripnichenko/nova,klmitch/nova,bigswitch/nova,cernops/nova,bgxavier/nova,sebrandon1/nova,Francis-Liu/animated-broccoli,JianyuWang/nova,hanlind/nova,openstack/nova,zaina/nova,CCI-MOC/nova,tealover/nova,JioCloud/nova,varunarya10/nova_test_latest,CCI-MOC/nova,MountainWei/nova,devendermishrajio/nova,double12gzh/nova,edulramirez/nova,edulramirez/nova,devendermishrajio/nova_test_latest,MountainWei/nova,CEG-FYP-OpenStack/scheduler,BeyondTheClouds/nova,iuliat/nova,felixma/nova,varunarya10/nova_test_latest,cloudbase/nova,Juniper/nova,alvarolopez/nova,mahak/nova,Juniper/nova,rajalokan/nova,openstack/nova,akash1808/nova_test_latest,Tehsmash/nova,mandeepdhami/nova,belmiromoreira/nova,sebrandon1/nova,Tehsmash/nova,tudorvio/nova,tangfeixiong/nova,mikalstill/nova,devendermishrajio/nova_test_latest,jianghuaw/nova,CEG-FYP-OpenStack/scheduler,Francis-Liu/animated-broccoli,vmturbo/nova,rajalokan/nova,barnsnake351/nova,jeffrey4l/nova,tudorvio/nova,gooddata/openstack-nova,zhimin711/nova,phenoxim/nova,zzicewind/nova,watonyweng/nova,JioCloud/nova,watonyweng/nova,ruslanloman/nova,klmitch/nova,ted-gould/nova,fnordahl/nova,bigswitch/nova,TwinkleChawla/nova,BeyondTheClouds/nova,dims/nova,dims/nova,vmturbo/nova,TwinkleChawla/nova,yatinkumbhare/openstack-nova,vmturbo/nova,scripnichenko/nova,shail2810/nova,CloudServer/nova,apporc/nova,eonpatapon/nova,shail2810/nova,j-carpentier/nova,double12gzh/nova,tangfeixiong/nova,mahak/nova,cyx1231st/nova,gooddata/openstack-nova,rajalokan/nova,takeshineshiro/nova,alvarolopez/nova,akash1808/nova_test_latest,mahak/nova,mmnelemane/nova,alaski/nova,rahulunair/nova,LoHChina/nova,JioCloud/nova_test_latest,jianghuaw/nova,yosshy/nova,klmitch/nova,cloudbase/nova,isyippee/nova,akash1808/nova,yosshy/nova,mandeepdhami/nova,kimjaejoong/nova,zaina/nova,Juniper/nova,ted-gould/nova,thomasem/nova,jianghuaw/nova,CloudServer/nova,alaski/nova,barnsnake351/nova,rajalokan/nova,ruslanloman/nova,rahulunair/nova,thomasem/nova,NeCTAR-RC/nova,hanlind/nova,bgxavier/nova,JioCloud/nova_test_latest,vmturbo/nova,NeCTAR-RC/nova,whitepages/nova,fnordahl/nova,cyx1231st/nova,felixma/nova,mikalstill/nova,jeffrey4l/nova,zhimin711/nova,iuliat/nova,eonpatapon/nova,raildo/nova,zzicewind/nova,rahulunair/nova,klmitch/nova,akash1808/nova,nikesh-mahalka/nova,gooddata/openstack-nova,sebrandon1/nova,gooddata/openstack-nova,LoHChina/nova,cernops/nova,kimjaejoong/nova,devendermishrajio/nova,mikalstill/nova,openstack/nova,JianyuWang/nova,isyippee/nova,yatinkumbhare/openstack-nova,takeshineshiro/nova,adelina-t/nova,j-carpentier/nova,mmnelemane/nova,whitepages/nova,raildo/nova,phenoxim/nova,apporc/nova,BeyondTheClouds/nova,jianghuaw/nova,nikesh-mahalka/nova,hanlind/nova,cernops/nova,Stavitsky/nova,Juniper/nova,belmiromoreira/nova,noironetworks/nova,noironetworks/nova,adelina-t/nova,tealover/nova